A spokesman for National Rail said: " Services are expected to be cancelled, delayed by up to 45 minutes or revised.

"We anticipate disruption will continue until 10:00.

"You can check your journey using the National Rail Enquiries real-time journey planner

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Delays expected at Bath Spa this morning

"You may be entitled to compensation if you experience a delay in completing your journey today. Please keep your train ticket and make a note of your journey, as both will be required to support any claim.

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"Signals can fail for different reasons, such as a power cut or blown fuse in the circuit. Our signalling system is designed to ‘fail safe’, to prioritise safety.

"Our network is designed so that if something stops working, such as a signal or a set of points, trains will stop before they reach it.

"So if there’s a power failure, the signal goes black and the driver knows not to pass a signal unless it has a green or yellow light; and if a point fails, the last signal before the set of points affected will automatically turn red so no trains pass."

Passengers are being advised to check the status of their service before travelling . You can check on your train by visiting National Rail's Journey Planner .

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